The busbar, typically observed as a white line across the solar panel, serves as a significant conduit for electrical currents produced by the photovoltaic cells. They're not there to look nice — they have a specific purpose. This white line is commonly referred to as the busbar, which is a metal conductor designed to efficiently collect and transport the electricity generated by the solar cells. The white lines on photovoltaic modules serve one of three important purposes, depending on whether they're the gaps, the fingers or the busbars. The gap lines are spaces between the solar cells, through which you can see the. . Often called grid-tied inverter. An inverter that reads the voltage of the grid or microgrid and produces as much power and current as it can, regardless of loads. For example, a 5kW inverter can only put out 5kW.